https://leetcode.com/problems/serialize-and-deserialize-bst/

1. 用到Java Queue接口，

// LinkedList實現了Queue接口, ArrayList沒有實現

2. 用的Java String.split 函數得到 String數組。

3. 另外一個bug是因為String比較用的 == ，沒有用 equals

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package com.company;import apple.laf.JRSUIUtils;import java.util.*;class TreeNode {int val;TreeNode left;TreeNode right;TreeNode(int x) { val = x; } }class Codec {// Encodes a tree to a single string.public String serialize(TreeNode root) {StringBuilder sb = new StringBuilder();if (root == null) {return "";}// LinkedList實現了Queue接口, ArrayList沒有實現Queue<TreeNode> qe= new LinkedList<>();qe.offer(root);sb.append(root.val+",");while (!qe.isEmpty()) {TreeNode tn = qe.poll();if (tn.left != null) {sb.append(tn.left.val+",");qe.offer(tn.left);}else {sb.append(",");}if (tn.right != null) {sb.append(tn.right.val+",");qe.offer(tn.right);}else {sb.append(",");}}return sb.toString();}// Decodes your encoded data to tree.public TreeNode deserialize(String data) {if (data.equals("")) {return null;}String[] strs = data.split(",");Queue<TreeNode> qe = new LinkedList<>();if (strs.length < 1 || strs[0].equals("")) {return null;}TreeNode root = new TreeNode(Integer.valueOf(strs[0]));qe.offer(root);int i = 1;while (!qe.isEmpty()) {TreeNode tn = qe.poll();if (strs.length > i && !strs[i].equals("")) {TreeNode left = new TreeNode(Integer.valueOf(strs[i]));tn.left = left;qe.offer(left);}i++;if (strs.length > i && !strs[i].equals("")) {TreeNode right = new TreeNode(Integer.valueOf(strs[i]));tn.right = right;qe.offer(right);}i++;}return root;} }public class Main {public static void main(String[] args) throws InterruptedException {System.out.println("Hello!");//Solution solution = new Solution();// Your Codec object will be instantiated and called as such:TreeNode tn = new TreeNode(2);TreeNode tn1 = new TreeNode(1);//TreeNode tn2 = new TreeNode(3);tn.left = tn1;//tn.right = tn2;Codec codec = new Codec();String code = codec.serialize(tn);System.out.printf("code:%s\n", code);TreeNode ret = codec.deserialize(code);System.out.printf("root:%d\n", ret.val);System.out.println();} }

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轉載于:https://www.cnblogs.com/charlesblc/p/6019644.html

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